Ninja (heatsink) duct upgrade

I was cleaning up my table, computer included, so decided to take this chance to make a duct for it.

I really love the Ninja's design - a square heatsink that simply allows air to flow through itself as if it is not there.

It is a fairly efficient fanless heatsink, but a duct boosts its cooling capability by a lot without an extra fan.

So here's what I did:


Another angle:


Yup, I'm using both system and PSU fan to suck out the air through the Ninja. Might be a bit of overkill - just the PSU fan might be enough.

If the sensor is correct, I'm idling at room temperature with system fan @ 700rpm, and that's after Linpacking. While Linpacking it is room temperature + 15 (assuming the room temperature is 22), with fan at ~860rpm.